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Hematocrit test

Also called: Hct, Packed cell volume, PCV

Hematocrit is the percentage of your blood made up of red blood cells. It usually moves together with hemoglobin.

SampleA small tube of blood from a vein in your arm
Fasting?Usually not needed
ResultsOften the same day
Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.

What the test is

It's part of a complete blood count (CBC).

Why it's done

  • Checking for anemia or dehydration
  • Monitoring testosterone therapy or polycythemia

Getting ready and what happens

  • No special preparation is needed.

How the test is done

  • A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.

What the results mean

ResultTypical range for adults
MenAbout 41% to 50%
WomenAbout 36% to 44%

Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.

Low

Anemia or blood loss, or extra fluid in pregnancy.

High

Dehydration, smoking, testosterone, sleep apnea, or polycythemia. Above about 54% on testosterone usually means the dose needs changing.

Questions to ask your provider

  • What do my results mean for me?
  • Do I need to repeat this test or have other tests?

Risks

A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.

Related conditions

Related medicines

Related tests

Sources

Last updated 2026-11-13.